Feeding device for percussive motors



Aug. 6, 1935. A. E. PETERS ET AL FEEDING DEVICE FOR PERCUSSIVE MOTORS Filed Dec. 7, 1934 A ogrzdmr THEIR ATTORNEY.

Patented Aug. 6, 1935 M UNIT ED STATES if? v V 2,010,496

-FEE-DING DEVICE FOR. PERCUSSIVE MOTORS- Arthur E. Peters, .Phillipsburg, L, and'Fred. Mi

Slater, Easton, Pa, assignors to ll'mierscllrfiandv Company, Jersey City, N Jr, a corporation of New Jersey 7 Application December 7,

1934, ser al: No; 756,404

t y, This; inv ntion, relates to: feedingdevices,. but: mo eparticulariyto reading devicefor; perriusa sive: motors, such; asarock: drillspands the like of the-type mounted onisupportingdevices relatively to;w,hiclr: they move 1' to; assure acorrect' operative relationship between themotor and the working implement which. the motor actuates;

Qnercbj ectofi'the inventionsisto utilize the jars resulting. upont reversalfof the hammer pistoni as arf'orce for..-movingi the motor longitudinallyof its supportt .i i

Anotherxob'jectz is .to assure the continuous actuationcofsithe motor: in one -dir'ectionfo'r moving it andii'etractingzitfromflzhe work;

Gther objectswill he in partobvious and in part, pointedouthereinafter. i In the accompanying drawing illustratingthe invention and in which similar referenc numerals refer to-similar parts; 7 t Figure 1 is alongitudinal ".ev-ation; in section; or a feeding" device constructed in accordance with-the praotice of the inventionand s'howingitapplied to apercussivemotor; the latter being partly brokenaway; I

Figures 2-' and 3 are transverse views taken through Figure 1 on: the lines- 2 2" and3"3, re- Spectively, and A 1 j v, Figures 45 and 5 are longitudinal sectional elevations-ofthe-portion gift-he feeding device 1 con: taming the controlling rnechanismand showing the-latterin -its various controlling positions.

Referring more particularlyto the drawingy20. designates a motor; illustrated as a rock; drill and comprising acylinder 21 front and back heads 22 and,23, respectively Therear end f of the cylinder may contain the usual: valve (not sho n). o .di t buii apress e fluidt t e. 37 nde 1' toja tuate, a r inr ry hammer. pis on?! in the. cy nder.v Til r headsZZi a d; 273; are securedjo' the cylinder; bythe usua1.'.side rods} 5,.a'nd; theiront, head 2,3jsupp9rts a,working implement .zt'la ainst lwhichthe hammer pis'ef tonjlis adapifid tosllrikfihl. T a

Asuitable support isproylded for the motor 23 in thejfo fmiofja. cradIeoLsheILZJ having..guide-. ways; ZEL. on; confronting surfaces 1 for; the .7 accom-d m ati n-g iaries, .cr: guides carried by the motoma' r v with thep'ractice. of. the inven-.

a .In accordance I H a tionrmeansare providedttoj efieetytheactuation of-rthemotor .fi longitudinally of the supporting-t shell 2'! by the jars or shoe-ks to which themoton is subjected upon reversalwithe -hammer piston V ZMinthe extremities ofi thecylinder 2,I-.-., Tolthis a cylinderfio is; securedgto the shell. 21 and ai-cylinderril :slidable'in the cylinder-3.6.:issecured to the motor 20.

The cylinden 3;! is provided at its front: end with a S138II11324W1'11C11 extendsrthrough an apex ture 33: of an arm 34'; clamped: between the front headq 22 and the cylinder-2|; The free endof the stem' fii isf threaded to accommodate a vnut? 35 which clamps thearm 34' to the cylinder 3 l-, and a: passage 36; in the stem serves as an inlet for liquid a-s for example oil 3 TyWhBIWiEh1111310311- inders-w and associated-passages are filled? The outenendiof,the-passage 36 maybe sealed by a fillertplugr38e On theoppositeend of the cylinder}! is ahead 39-of whichthe inner surface constitutes a pressure surface 40, andthe outer end of the head 39- is exposed-to atmospheric ipressure maintained in the rear end of the cylinder through a vent: 4]; The inner surface of the frontend of the cylinder 30,:forms, an opposing pressure surface lli." and'in i the adjacent wall of 4 the cylinder 3 I; is a packing member 43 to effect a seal at that: end of the-cylinder. A gland M-threadedinto the cylinder 3Q-seryes to-compress the packing'mem: her; 43; 1 l

A closure isiprovidedgfort the rear end ofthe, cylinder 39: by a head 45 which: may be -bo1ted, or otherwise secured to the cylinder 39 and carries a=rodA5iwhich extends into and seals-the-rear: endof the cylinder -SL Thefree end of the rod 46 serves as a pressure surface '4-Lwhich; confronts a pressure surface-48in the front-end of the cy1-- inder3t-i". v

Within=the rod-4G; the-head tli and the cylinder 301s a passage 49-:toaifcrd communication between the cylinders;- --The passage 49' is bisectediby bore ;59;-in thec-head45,-,and:the borecontains valve mechanism 51 adapted to controlcommunication between the cylinders ,andltor determine the direction of how of the fluidriil'.

The valvemechanism 5| comprises. a throttle valve 52of the rotary typehavinga passagev53 to.

afford communication betweenthe adjacentpore tions of the passage 49. Withinithe passage 53vlis.

a bevelled seating surface 54 for a.valve 55iwhichv is normally. held to its seat byfla springjfilseating againstla plug 51 in theend of the passage. 53. The plug fi'lis suitably'recessed, 'asby forminga series of slots 58Hinits periphery tohpermitifree. communicationbetween the passages 53Yand 49,.

The: valve 5.1, illustrated as-being of the p oppet: type, carries aguide stemifl whichextends slid ably into the passage 53=and=has-flutes Gil-which,

serve as :passages tfor theliquid 31.

The operation of the device-is as follows: Let

it be assumed that the motor is in operation, that is, that the hammer piston 24 is reciprocating within the cylinder 2| to deliver blows against the working implement 26. With the motor thus operating it is, of course, essential that it be kept within the correct operating position relatively to the working implement so that the force of the hammer piston may be eifectively applied to the working implement for driving it into the work.

In order to assure this desirable position of the motor the throttle valve is rotated to the position illustrated in Figure 4 to permit the passage of liquid 31 from the cylinder 30 through the passages 49 and 53 into the cylinder 3|. Thus, when the piston 24 imparts a shock to the front end of the motor the cylinder 3| is carried forwardly and liquid is ejected from the cylinder 30 by the pressure surfaces 40 and 42 and transferred into the cylinder 3| which is thereby maintained completely filled as are, of course, also the cylinder 30 and the passages affording communication between the cylinders.

Upon transference of liquid from the cylinder 30 into the cylinder 3| at the termination of each forward stroke of the piston 4| the check valve 55 is immediately returned to its seat by the spring 56 to prevent a reverse flow of liquid to the cylinder 30 upon reversal of the piston 24 in the rear end of the cylinder 2|. The liquid thus entrappedin the cylinder 3| prevents recoil of the motor 29 and maintains it in the correct position with respect to the working implement 26 for the succeeding working stroke of the piston 24. This cycle of operation may continue until the working implement has penetrated the work to the limit of its extent, whereupon the throttle valve 5| is shifted to the position illustrated in Figure 5.

In the new position of the throttle valve the check valve is positioned to permit the fiow of liquid only from the cylinder 3| to the cylinder 30. Thus, when the piston 24 reverses in the rear end of the cylinder 2| the jar resulting from the act of reversal is imparted to the cylinder 3| and a portion of the liquid 31 is expelled through the passages 49 and 53 into the cylinder 30 at the end of each rearward stroke of the piston 24. The motor is thereby caused to be retracted from the work and the liquid entrapped in the cylinder 30 prevents recoil of the motor in a forwardly direction at the instant of reversal of the hammer piston 24 in the front end of the cylinder.

The motor and the feeding device will continue to function in this wise until the working implement has been withdrawn from the drill hole after which a longer working implement may be inserted in the drill and the valve mechanism 5| is again shifted to cause actuation of the motor towards the work.

We claim:

1. In a feeding device, the combination of a support and a motor slidable on the support, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a stationary cylinder, a movable cylinder in the stationary cylinder and being afiixed to the motor, means providing passages to communicate the cylinders with each other, pressure surfaces on the cylinders, a body of liquid in the cylinders and the passages, and means for controlling the transference of liquid from one cylinder to the other, whereby the liquid displaced in one cylinder by the jar resulting upon reversal of the piston at the end of one stroke is introduced into the other cylinder to prevent recoil of the motor upon reversal of the piston at the end of the succeeding stroke.

2. In a feeding device, the combination of a support and a motor slidable on the support, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a stationary cylinder, a movable cylinder in the stationary cylinder and being amxed to the motor, means providing passages to communicate the cylinders with each other, a body of liquid in the cylinders and being forced from one cylinder to the other by the jars resulting upon reversal of the piston, and means for controlling the direction of flow of the liquid whereby one cylinder is selectively caused to serve as a feed reservoir for the liquid and the other cylinder as a receptacle for the liquid to prevent recoil of the motor.

3. In a feeding device, the combination of a support and a motor slidable on the support, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a stationary cylinder, a movable cylinder in the stationary cylinder and being aflixed to the motor, means providing passages to communicate the cylinders with each other, a body of liquid in the cylinders and being forced from one cylinder to the other by the jars resulting upon reversal of the piston, means for forcing the liquid from one cylinder to the other upon relative longitudinal movement of the cylinders, and means for selectively determining the direction of flow of the liquid and thereby cause either cylinder to-serve as a feed reservoir and the other cylinder as a receptacle for liquid to prevent recoil of the motor at the end of one of the strokes of the piston.

4. In a feeding device, the combination of a support and a motor slidable thereon, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a stationary cylinder, a movable cylinder slidable in the stationary cylinder and being afiixed to the motor, pressure surfaces on the cylinders, a passage affording communication between the cylinders, a body of liquid in the cylinders and the passage, and valve means in the passage for controlling the direction of flow of the liquid whereby a portion of the liquid subjected to the jar resulting upon reversal of the piston at one end of its stroke is forced into the other cylinder to prevent recoil of the motor upon reversal of the piston at the other end of its stroke.

5. In a feeding device, the combination of a support and a motor slidable thereon, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a stationary cylinder, a movable cylinder slidable in the stationary cylinder and being afiixed to the motor, pressure surfaces on the cylinders, a passage affording communication between the cylinders, a body of liquid in the cylinders and the passage, a throttle valve controlling the passage, and a check valve in the throttle valve for determining the direction of flow of the liquid whereby a portion of the liquid subjected to the jar resulting upon reversal of the piston at one end of its stroke is forced into the other cylinder to prevent recoil of the motor upon reversal of the piston at the other end of its stroke.

6. In a feeding device, the combination of a support and a motor slidable thereon, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a plurality of relatively movable receptacles arranged telescopically with respect to each other and one of which is connected to the motor, means providing passages to communicate the receptacles with each other, a body of liquid in the receptacles,- pressure surfaces in the receptacles for forcing the liquid from one receptacle into another to prevent recoil of the motor upon reversal of the piston, and means for controlling the direction of flow of the liquid.

7. In a feeding device, the combination of a support and a motor slidable thereon, a reciprocatory hammer piston in the motor imparting jars thereto tending to move the motor longitudinally of the support, a stationary cylinder aflixed to the support, a movable cylinder affixed to the motor and extending slidably into the stationary cylinder, a rod on the stationary cylinder extending into the movable cylinder, a passage in the rod and the stationary cylinder to afford communication between the cylinders, a body of liquid in the cylinders and the passage, pressure surfaces on the cylinder and on the rod for forcing the liquid from one cylinder into another to prevent recoil of the motor upon reversal of the piston, and control means for the passage to determine the direction of flow of the liquid.

ARTHUR E. PETERS.

FRED M. SLATER. 

